You put a solution of sucrose into a bag of dialysis tubing, which is permeable to water but not to sucrose. You then put this bag into a beaker of water. An hour later, you observe that the bag has swelled due to
A. the pressure exerted on the bag by the surrounding water.
B. the osmotic pressure of the sucrose solution.
C. the high osmolarity of the surrounding water.
D. passive transport of sucrose molecules.
E. active transport of water molecules.
Answer: B
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A mutation that changes the amino acid sequence of the resulting protein by substitution is called a ________ mutation.
A. missense B. silent C. nonsense D. None of the choices are correct.
Which of the following is a true statement about proteins?
A. Proteins are used to insulate the body from cold and protect it from abuse. B. Extra proteins are stored in the liver and brain. C. Proteins are made up of amino acids bonded together. D. Proteins are used to produce ATP for the cell. E. Even small changes in temperature and pH will immediately destroy a protein's shape and function.
The tall and short phenotypes in pea plants are examples of
A. polygenic traits. B. continuous traits. C. multifactorial traits. D. discontinuous traits. E. gene interaction.
The atmosphere performs several essential ecological functions. One of these is to:
a. protect Earth from all infrared radiation. b. reduce the amount of visible light reaching Earth c. provide plants with nitrogen needed for photosynthesis d. protect Earth from microwave radiation e. protect Earth from most ultraviolet radiation